Which of these statements is not true ?

Question

(a) $\;NO^{+}\;$ is not isoelectronic with $\;O_{2}\;$ \[\](b) B is always covalent in its compounds \[\](c) In aqueous solution , the $\;Ti^{+}\;$ ion is much more stable than TI (III)\[\] (d) $\;LiAlH_{4}\;$ is a versatile reducing agent in organic synthesis